Satellite images released today by the British Antarctic Survey and the National Snow and Ice Data Center reveal a massive collapse over the past month—disintegration resulting in, most recently, a breakaway iceberg seven times the size of Manhattan.

Now, the entire shelf is attached by a single strip of ice less than 4 miles wide. "The ice shelf is hanging by a thread," said Professor David Vaughan of the BAS. "We'll know in the next few days or weeks what its fate will be." Over the last few decades the western Antarctic Peninsula has seen the biggest temperature change on Earth. It has also experienced an increasing number of major collapses as warmer temperatures and previously unexposed ocean waves erode its shelves. Wilkins, which scientists believe is at least a few hundred years old, is the largest yet to succumb, and likely a harbinger of more to come.

Update: Well, not so fast. Turns out there is an active underwater volcano near the ice shelf which is heating up the surrounding water and lubricating the ice shelves.